Exchange rates are among the most important prices in the global economy. They affect the price of every country’s imports and exports, as well as the value of every overseas investment. Over the past decade, some Members of Congress have been concerned that foreign countries are using exchange rate policies to gain an unfair trade advantage against other countries, or “manipulating” their currencies. Congressional concerns have focused on China’s foreign exchange interventions over the past decade to weaken its currency against the U.S. dollar, although concerns have also been raised about a number of other countries pursuing similar policies.